/* * Copyright (c) 1995 The Regents of the University of California. * All rights reserved. *  * Permission to use, copy, modify, and distribute this software and its * documentation for any purpose, without fee, and without written agreement is * hereby granted, provided that the above copyright notice and the following * two paragraphs appear in all copies of this software. *  * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *  * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. */extern int LUM_RANGE;extern int CR_RANGE;extern int CB_RANGE;#define CB_BASE 1#define CR_BASE (CB_BASE*CB_RANGE)#define LUM_BASE (CR_BASE*CR_RANGE)extern unsigned char pixel[256];extern unsigned long wpixel[256];extern int *lum_values;extern int *cr_values;extern int *cb_values;#define Min(x,y) (((x) < (y)) ? (x) : (y))#define Max(x,y) (((x) > (y)) ? (x) : (y))#define GAMMA_CORRECTION(x) ((int)(pow((x) / 255.0, 1.0 / gammaCorrect) * 255.0))#define CHROMA_CORRECTION256(x) ((x) >= 128 \                        ? 128 + Min(127, (int)(((x) - 128.0) * chromaCorrect)) \                        : 128 - Min(128, (int)((128.0 - (x)) * chromaCorrect)))#define CHROMA_CORRECTION128(x) ((x) >= 0 \                        ? Min(127,  (int)(((x) * chromaCorrect))) \                        : Max(-128, (int)(((x) * chromaCorrect))))#define CHROMA_CORRECTION256D(x) ((x) >= 128 \                        ? 128.0 + Min(127.0, (((x) - 128.0) * chromaCorrect)) \                        : 128.0 - Min(128.0, (((128.0 - (x)) * chromaCorrect))))#define CHROMA_CORRECTION128D(x) ((x) >= 0 \                        ? Min(127.0,  ((x) * chromaCorrect)) \                        : Max(-128.0, ((x) * chromaCorrect)))